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The luminosity of the double-mode Cepheid Y Carinae
Evans, Nancy R.
AA(York University, North York, Canada; Computer Sciences Corp., Silver Spring, MD)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 385, Feb. 1, 1992, p. 680-684. Research supported by NSERC. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Cepheid Variables, Companion Stars, Stellar Luminosity, Stellar Oscillations, Stellar Spectra, Ultraviolet Astronomy, Hertzsprung-Russell Diagram, Iue
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IUE spectra of the double-mode Cepheid Y Carinae have been used to determine the spectral type of the binary companion. From the companion spectral type (B9.O V), the absolute magnitude of the Cepheid is found to be -2.94 mag, with an estimated uncertainty of +/-0.3. This luminosity is in good agreement with that from the period-luminosity-color relation of Feast and Walker for the fundamental mode. This agreement, together with the large magnitude difference between the B9.0 V star and the Cepheid, confirm that the Cepheid is a normal classical Cepheid with a mass much larger than that inferred from the ratio of the two periods (beat mass). The two double-mode Cepheids with independently determined luminosities (Y Car and V 367 Sct) both fall on the blue edge of the instability strip.

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